Video: Gemvara founder Matt Lauzon interrupts an apparent robbery

"You're lucking out that I'm here and not freaking out, but please just don't come back."

That's what Matt Lauzon, the founder of Gemvara and most recently the founder of Boston startup dunwello, told a man who'd walked into his Boston office on Thursday, apparently with plans to rob the office.

The incident was captured on surveillance video; the confrontation is off camera, but you can clearly hear most of what was said (see below).

"I've been in some bad situations myself. I'm not going to call anyone or anything," Lauzon can be heard telling the man, who then leaves the building.

Lauzon initially disclosed the incident on Twitter Thursday. "i just walked in to an office being robbed. convinced robber to leave empty handed and not stab me. and it was crazy," the first tweet read. The incident "scared the crap out of me but on the bright side i think i may have had a positive impact on the guy's life," he wrote in another tweet.

In a blog where he shared the surveillance video, Lauzon wrote that "one thing i’ve learned about building a new company is that you never know what you’ll encounter on any given day at the office."